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Stable angina is primarily caused by an imbalance between oxygen delivery to the heart tissue and the oxygen demand of the heart. This condition typically occurs during physical activity or stress, when the heart's demand for oxygen increases. However, if the coronary arteries are narrowed due to atherosclerosis, they may not be able to supply enough oxygen-rich blood to meet this elevated demand, resulting in the characteristic chest pain or discomfort known as angina.

In stable angina, this situation is predictable and often resolves with rest or the use of nitroglycerin. The episodes of pain are typically similar in intensity and duration, which differentiates stable angina from unstable angina, where symptoms can vary and occur unpredictably.

Understanding the mechanisms behind stable angina helps in recognizing triggers and managing symptoms effectively, often involving lifestyle modifications and medications aimed at improving coronary blood flow or reducing the heart’s oxygen demand.